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Prepreg, fiber-reinforced composite material, and method for producing fiber-reinforced composite material

A technology of prepregs and constituent elements, applied in the field of prepregs, can solve the problem that the dynamic mechanical strength cannot be fundamentally improved, and achieve the effect of excellent durability and sufficient heat resistance

Pending Publication Date: 2022-07-15
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, even if the strength of the reinforcing fibers is increased, the dynamic mechanical strength, especially the impact resistance from the outside, cannot be fundamentally improved as long as the damage of the interlayer region is not suppressed.

Method used

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  • Prepreg, fiber-reinforced composite material, and method for producing fiber-reinforced composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0176] The present invention will be specifically described below by way of examples, but the present invention is not limited to these examples.

[0177]

[0178] The raw materials used in Examples 1 to 3 and Comparative Examples 1 to 6 are shown below.

[0179] (Component (A))

[0180] TR50S: carbon fiber bundle (Mitsubishi Chemical, PYROFIL (registered trademark) TR50S 15L, single-filament strength: 4900MPa, elastic modulus: 240GPa, fiber diameter of carbon fiber: 6.8 μm, number of carbon fibers: 15,000)

[0181] (Component (B))

[0182] [Epoxy resin]

[0183] ·YD-128: Bisphenol A liquid epoxy resin (Nippon Steel Chemical & Materials)

[0184] ·jER1002: bisphenol A solid epoxy resin (Mitsubishi Chemical)

[0185] YDPN-638: Phenol novolac type semi-solid epoxy resin (Nippon Steel Chemical & Materials)

[0186] ·YD-952: with Epoxy resin with oxazolidone ring skeleton (Nippon Steel Chemicals & Materials)

[0187] YX7400: Liquid 2-functional epoxy resin (Mitsubishi Ch...

Embodiment 2

[0218] (modulation of component (B))

[0219]As the raw material composition 2a of the component (B), 38 parts by mass of YD-128, 5 parts by mass of YX7400, 27 parts by mass of jER1002, 28 parts by mass of YD-952, and 2.8 parts by mass of VINYLEC E were put into a glass flask. Using an oil bath having a temperature of 140 to 160° C., the mixture is heated and mixed until the raw material composition 2a becomes uniform.

[0220] The raw material composition 2b of the component (B) was obtained by the same procedure and compounding as in 1b of Example 1. 100.8 parts by mass of the raw material composition 2a and 22 parts by mass of the above-mentioned raw material composition 2b in a glass flask that was allowed to cool to a temperature of about 60°C were placed in the container of the planetary mixer, the jacket temperature was set to 60 to 65°C, and the The mixture was mixed until each became uniform, and the component (B) used in Example 2 was obtained.

[0221] (Preparatio...

Embodiment 3

[0228] (modulation of component (B))

[0229] The component (B) used in Example 3 was obtained by the same procedure as in Example 1.

[0230] (Preparation of mixture (BC))

[0231] To 122.5 parts by mass of the prepared component (B), 35 parts by mass of ARX30 was added. Therefore, the content of ARX30 is 22.2 mass % with respect to the total of 100 mass % of the constituent element (B) and the constituent element (C). The jacket temperature of the planetary mixer was set to 60 to 70° C., and the mixture was mixed until uniform, thereby preparing a mixture (BC) of the component (B) and the component (C).

[0232] (production of prepreg)

[0233] The prepreg used in Example 3 was produced by the same method (α) as in Example 1 except that the mixture (BC) was changed. The composition and production method of the prepreg are shown in Table 1.

[0234] (Manufacture of fiber-reinforced composite materials)

[0235] By the same method as in Example 1, a molded plate for eval...

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Abstract

Provided are: a prepreg which makes it possible to obtain a fiber-reinforced composite material in which interlayer peeling during point impact is suppressed; a fiber-reinforced composite material having excellent resistance during point impact; and a method for producing the fiber-reinforced composite material. A cured product obtained by curing this prepreg under specific curing conditions has a projected area of a damaged part of 400 mm2 or less as measured by a specific test 1, and the maximum value of tan [delta] of the cured product as measured by a specific test 2 is observed at 100 DEG C or higher. This prepreg contains a reinforcing fiber base material, an epoxy resin composition, and a polymer (C2), the polymer (C2) being present on the outermost surface of the prepreg, and the polymer (C2) having a glass transition temperature of 10 DEG C or less as observed under specific measurement conditions. The manufacturing method of the fiber reinforced composite material comprises the step of heating and forming the prepreg.

Description

technical field [0001] The invention relates to a prepreg, a fiber-reinforced composite material, and a manufacturing method of the fiber-reinforced composite material. [0002] This application claims priority based on Japanese Patent Application No. 2019-237641 filed in Japan on December 27, 2019, the content of which is incorporated herein by reference. Background technique [0003] Fiber-reinforced composite materials are lightweight, strong and rigid, so they are widely used in sports, leisure, automotive, aircraft, and other general industrial fields. Recently, in the automotive field, the aircraft field, and the like, fiber-reinforced composite materials that are lightweight, have high strength, and are high in rigidity have been used in particular. [0004] Fiber-reinforced composite materials are materials composed of reinforcing fibers and matrix resins. Fiber-reinforced composites are anisotropic materials with extremely high strength and elastic modulus for str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/24B29C70/06
CPCC08J5/243C08J2363/00C08J2363/02C08J2363/04C08J2433/04C08J5/04
Inventor 野原敦
Owner MITSUBISHI CHEM CORP
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